Interesting project! I took your idea and attempted to make a holder for a 2.5mm allen key to fit my new Hychika mini electric screwdriver, because I use M3 hex head bolts and annoyingly they are H2.5 and the screwdriver comes with H0.9, H1, H2 and H3. Aaaargh!!! I've ordered an H2.5 (Hex 4mm screwdriver end) from Aliexpress but that's months away, so I had a stab at printing one. Total fail printing a 4mm H2.5 complete bit because while 4mm hex comes out fine on a 3D printer, my Elegoo Neptune3Pro can't quite manage the H2.5 tip, it's pretty much a cylinder rather than hex. Again with the AAARGH! And designing an allen holder like yours for a 4mm chuck leaves the joint where the key exits the holder so weak that it falls apart at the slightest twist. I've bulked up the design and it's up for testing today. If it succeeds, then it would be fun to try to make it attract into the magnetic chuck.
So, I'm wondering just how much ferrous metal needs to be on the back end of the allen holder to give sufficient magnetic attraction to hold it in the chuck. My first thought was either a little screw or a small nail/tack. Glueing a patch of metal to the back end of the holder carries the risk that if it detaches then you've got a bit of metal stuck in your magnetic chuck which will be very hard to remove. The advantage of a screw (screwed into the end) or a nail (glued into the end) is that it's much less likely to detach. So I guess the next test is to see how big a screw/tack/nail needs to be to get a positive attraction to the magnetic chuck :o)
@Gigabeast_1178074 UPDATED - tests reveal there may be enough attraction to a "tuppeny nail" to make it worth a trial print. Historically, nails were classified according to how many old pennies it cost to buy 120 nails, and the simple round hand-forged 1" nail cost 2d for 120 nails, so that's a tuppeny nail, hehehe. The head of one of those gets grabbed fairly nicely by my 1/4" hex (6.5mm) screwdriver, and the pointy end gets grabbed by my 4mm drive mini-screwdriver. The head doesn't QUITE fit in my mini so I'll have to nip a bit off the head with a file and try again, but it's promising. Then if a suitable hole was printed in the back end of the holder, and the nail nipped off with wire cutters to a matching length, just add a touch of glue and push it into the hole, and there you go, a plastic allen holder that magnetically holds into a screwdriver chuck :o)
I ended up doing a complete remix for my 4mm driver and just an H2.5 key as that's what I needed. The nail idea actually works :o) The remix has been published now so you'll find it linked in your listing page. Cheers!
Die Klemmen halten prima an meiner RegALux-Box vom Bauhaus, besten Dank! (edited)
it fits perfectly, unscrew it seems not posible when removing old plastic, probably is glued. i suggest print it with 50 infill or more . I print it with 15% and is not too strong so i cannot tighten the thread as much as i would like.
